Gustav:
If you check Mouse Wheel Scrolls Graph View in the Preferences you can scroll the state machine in the view vertically. It would be consistent to allow horizontal scrolling too, like other programs do. For example Photoshop: If you hold Ctrl the image scrolls horizontally. Because in this case, if the option mentioned above is checked, the Graph View zooms in and out while holding down Ctrl, it would be also okay to use Shift for horizontal scrolling (in both cases of this option).

It's just a suggestion for better user experience. :)

RegardsGustav

Alex Chouls:
Great suggestion! This was really quick to add - it will be in the next update :)